Printing-press



2 Sheets-Sheet 1.

' T. FORKNALL.

PRINTING PRE S.

(No Model.)

Patented Nov. 18, 1884.

V INVENTOR: v

ATTORNEYS.

(No Model.) S 2 Sheets-Sheet 2. T. FORKNALL.

PRINTING PRESS. No. 308,150. Patented Nov. 18, 1884.

WITNESSES: DIVENTOR:

ATTORNEYS;

UNITED STATES THOMAS FORKNALL,

PATENT ()rricn.

WATSON, OF NEWARK, NEW JERSEY.

PRINTING-PRESS.

SPECIFICATION forming part of Letters Patent No. 308,150, dated November 18, 1884.

Application filed November 1, 1883. (No model.)

To all whom it may concern:

Be it known that I, THOMAS FORKNALL, of Manchester, England, have invented certain new and useful Improvements in Printing- Presses, of which the following is a full, clear,

and exact description.

This invention relates to certain new and useful improvements in printing-presses, and has for its object to facilitate the adjusting of the platen according to the thickness of the paper upon which the impression is to be made.

The invention consists in a ring orcircular plate held in place on the yoke by screws and having its outer circular edge screw-threaded, on which plate a ring-nut is screwed, whereby by turning the said ring-nut the platen Will be pressed a greater or less distance from the yoke.

The invention also consists in various parts and details, as will be fully set forth hereinafter.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side View of my improvement. Fig. 2 is a rear view of the same. Fig. 3 is a sectional view on line as m, Fig. 2.

The platen A is held on a yoke, B, by two screws, 0, passing loosely through lugs of a cross-piece, D, of the yoke, and screwed into the back of the platen, which screws are each surrounded by aspiral spring, E, between the head of the screw and the lugs of cross-piece D, which springs E draw the platen toward the cross-piece D. Any other suitable springs can be used in place of the spiral springs E. A ring or circular plate, K, provided with a screw-thread on its outer edge, is held in place by the four screws H, the ends of which pass into recesses or apertures in the rear surface of the said ring or plate K. A ring-nut, L, having a screw-thread out in its inner circular edge, surrounds the circular plate K, and can be screwed on the same. If the nut L is turned on the circular plate or ring K, its

front surface will be moved toward or from the yokethat is, by turning the nut L the platen A can be pressed a greater or less distance from the yoke B, or by turning the nut L in the inverse direction the springs E are permitted to draw the platen a greater distance toward the yoke.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a yoke and platen, of a ring or circular plate provided with a screw-thread on its outer edge, and held in place on the yoke by screws, and a ring-nut screwed on the screw-threaded circular plate or ring, substantially as herein shown and described.

2. The combination, with the yoke B and the platen A, held on the yoke by screws O and springs, of a circular plate or ring, K, having its outer circular edge screw-threaded, which circular plate or ring is held in place on the yoke by screws H,. and of the ring-nut L, screwed on the plate or ring K, substantially as herein shown and described.

3. The combination, with the yoke and platen, of a screw-threaded plate and nut placed between them for adjusting the platen, substantially as herein shownand described.

THOMAS FORKNALL.

Witnesses:

ARTHUR G. HALL, JAMES THORNHILL. 

